![]() Paper dial to convert a 12-hour clock face to decimal time, presented to the Revolutionary Committee of Public Instruction by Hanin. It also adjusts well to digital time representation using epochs, in that the internal time representation can be used directly both for computation and for user-facing display. 54321 can be interpreted as five decimal hours and 43 decimal minutes and 21 decimal seconds after the start of that day, or a fraction of 0.54321 (54.321%) through that day (which is shortly after traditional 13:00). This property also makes it straightforward to represent a timestamp as a fractional day, so that. For instance, 1 h23 m45 s is 1 decimal hour, 23 decimal minutes, and 45 decimal seconds, or 1.2345 decimal hours, or 123.45 decimal minutes or 12345 decimal seconds 3 hours is 300 minutes or 30,000 seconds. Therefore, it becomes simpler to interpret a timestamp and to perform conversions. The main advantage of a decimal time system is that, since the base used to divide the time is the same as the one used to represent it, the representation of hours, minutes and seconds can be handled as a unified value. This term is often used specifically to refer to the French Republican calendar time system used in France from 1794 to 1800, during the French Revolution, which divided the day into 10 decimal hours, each decimal hour into 100 decimal minutes and each decimal minute into 100 decimal seconds ( 100 000 decimal seconds per day), as opposed to the more familiar standard time, which divides the day into 24 hours, each hour into 60 minutes and each minute into 60 seconds ( 86 400 SI seconds per day). The large dial shows the ten hours of the decimal day in Arabic numerals, while the small dial shows the two 12-hour periods of the standard 24-hour day in Roman numerals.ĭecimal time is the representation of the time of day using units which are decimally related. At 11:58:24 UTC 16 September 2023 ( update)įrench decimal clock from the time of the French Revolution. We wanted to tell you that we built a nice converter for you, here it is.Not to be confused with Metric time. The hh:mm addition persisted, and at the very end the hh:mm format would be converted to decimal hours for payroll. The early computer systems simply mimicked their predecessors. So what came next, computer based punching.And again a payroll person would convert to decimal hours. An employee would insert their punch card and what would be “punched” on it, again a time in the hh:mm format. The next time clocks were the old school wall mounted punch clocks.To calculate worked time, a payroll person would figure hours and minutes worked, but would then convert to decimal hours to do the multiplication. What would they write down? Times such as 8:00am and 5:00pm. ![]() A person would simply write down when an employee got to work and when they went left work. The very first time clocks were people.While we could not find a lot of data on why the hh:mm format lasted so long we do have a few ideas… It’s much easier to multiply 8.20(or 8 hours and 12 minutes) by an hourly rate to calculate payroll. Kinda technical, sorry.ĭecimal hours are easier to work with - Imagine trying to multiply 8:12 (which is 8 hours and 12 minutes) by an employee hourly rate. Minute hours have a maximum of 1/60 resolution, while decimal hours have a 1/100 resolution. They are more precise - decimal hours are almost 2 times more precise than minute hours. Why use decimal hours? We use decimal hours for two reasons… 8.45 hours - this one is 8 hours and 27 minutes.8.20 hours - you may want to read this as 8 hours and 20 minutes, but notice the decimal point, it is actually 8 hours and 12 minutes.Here are a few which are commonly confused. 8.75 hours - 8 hours and 45 minutes OR 8:45.8.50 hours - here we have 8 and ½ hours or 8 hours and 30 minutes.8.25 hours - this is 8 and 1/4 hours, or 8 hours and 15 minutes OR 8:15 (hh:mm again), again note the colon.8.00 hours - this is exactly 8 hours OR 8:00 in the hh:mm format - note colon, not a decimal point.Here are a few examples of decimal hours and how to interpret them… Decimal hours can sometimes cause a bit of confusion for people who are used to looking at hours in the hh:mm format. So our time cards page displays employee hours in the decimal hours format. The big thing to look for is a decimal point(.) or colon(:)
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